Add partial Health Connect permissions + DB migration retry

[fiddur]

Summary

• Android: Partial permissions support — Users can now sync whatever data types they've authorized instead of needing all 40+ permissions. The sync screen is redesigned from a debug record list to a clean card-based UI showing per-category permission status with individual grant buttons.
• Backend: DB migration retry on schema errors — When a query hits a missing table/column (42P01/42703), it automatically runs migration and retries once. This fixes errors for long-lived sessions after deployments that add new schema.

Changes

Android

• New HealthConnectPermissions.kt — 6 user-friendly data categories with pure helper functions
• MainActivity.kt — Refactored from hasPermissions: Boolean to granular permission state; card-based sync UI replaces debug record list
• HealthConnectSyncWorker.kt — Background sync works with partial permissions; filters aggregate metrics to granted types
• Changes token invalidated when granted types change (forces safe re-fetch)

Backend

• connection.ts — Added _isSchemaError, _runMigrationOnce (coalescing mutex), and retry logic in query()
• connection.test.ts — 14 unit tests covering schema error detection, mutation coalescing, retry/no-retry paths

Test plan

• Backend: All 692 unit tests pass
• Android: Compiles cleanly, all unit tests pass (including new HealthConnectPermissionsTest)
• Manual: Sara can test granting partial permissions on her phone

🤖 Generated with Claude Code

[codecov]

Codecov Report

❌ Patch coverage is 26.55738% with 224 lines in your changes missing coverage. Please review.
✅ Project coverage is 27.39%. Comparing base (965dc2e) to head (d7f5511).
⚠️ Report is 2 commits behind head on develop.

Files with missing lines	Patch %	Lines
...roid/app/src/main/java/net/aurboda/MainActivity.kt	0.00%	190 Missing ⚠️
...c/main/java/net/aurboda/HealthConnectSyncWorker.kt	0.00%	32 Missing ⚠️
.../main/java/net/aurboda/HealthConnectPermissions.kt	96.29%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #241      +/-   ##
===========================================
+ Coverage    27.20%   27.39%   +0.19%     
===========================================
  Files          175      176       +1     
  Lines        23517    23642     +125     
  Branches      2094     2104      +10     
===========================================
+ Hits          6397     6476      +79     
- Misses       17081    17127      +46     
  Partials        39       39              

Flag	Coverage Δ
android	8.77% <18.84%> (+1.17%)	⬆️
backend	57.58% <100.00%> (+0.11%)	⬆️
web	3.02% <ø> (ø)

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